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29,734 Article Results

Application of “The nature of science” box event examples to middle school seventh grade students

10.11591/ijere.v8i2.18858
Özlem Afacan , Demet Şener Çanlı
Previous study on the nature of science indicated that the use of activities is essential and important in the teaching of the nature of science subjects. The aim of the research is to develop alternative activities for helping students in the seventh grade of middle school develop their views on the nature of science and for better teaching the nature of science. In this study, four different activities suitable for middle school seventh class achievements which are also related to the nature of science were developed and worksheets related to those activities were prepared. The activities and worksheets were examined by two science education experts and necessary arrangements were made in line with their opinions. These events are called; "mystery candle inbox", "following trail", "mystery in box", and "Colorful lights" activity. This study was designed according to case study settings from qualitative research methods. The research group consists of 27 students who are in the seventh grade of a middle school in Kırşehir. When the activities are being carried out, students filled in worksheets for each activity. The worksheets were analyzed by content analysis method. At the end of the research, it was determined that the designed and applied the nature of science activities have a positive effect on the development of the students' opinions about the nature of science.
Volume: 8
Issue: 2
Page: 221-228
Publish at: 2019-06-01

Bulk binding approach for PMIPv6 protocol to reduce handoff latency in IoT

10.11591/ijece.v9i3.pp1894-1901
Adnan J. Jabir
Mobility management protocols are very essential in the new research area of Internet of Things (IoT) as the static attributes of nodes are no longer dominant in the current environment. Proxy MIPv6 (PMIPv6) protocol is a network-based mobility management protocol, where the mobility process is relied on the network entities, named, Mobile Access Gateways (MAGs) and Local Mobility Anchor (LMA). PMIPv6 is considered as the most suitable mobility protocol for WSN as it relieves the sensor nodes from participating in the mobility signaling. However, in PMIPv6, a separate signaling is required for each mobile node (MN) registration, which may increase the network signaling overhead and lead to increase the total handoff latency. The bulk binding approaches were used to enhance the mobility signaling for MNs which are moving together from one MAG to another by exchanging a single bulk binding update message. However, in some cases there might be several MNs move at the same time but among different MAGs. In this paper, a bulk registration scheme based on the clustered sensor PMIPv6 architecture is proposed to reduce the mobility signaling cost by creating a single bulk message for all MNs attached to the cluster. Our mathematical results show that the proposed bulk scheme enhances the PMIPv6 performance by reducing the total handoff latency.
Volume: 9
Issue: 3
Page: 1894-1901
Publish at: 2019-06-01

Electrical and thermal efficiency of air-based photovoltaic thermal (PVT) systems: an overview

10.11591/ijeecs.v14.i3.pp1134-1140
Nurul Shahirah Binti Rukman , Ahmad Fudholi , Ivan Taslim , Merita Ayu Indrianti , Intan Noviantari Manyoe , Uce Lestari , Kamaruzzaman Sopian
The development of photovoltaic thermal (PVT) system is a very promising area of research. PVT systems using in various applications, such as solar drying, solar cooling, water heating, desalination, and pool heating. With the recognition of the potentials and contributions of PV system, considerable research has been conducted to attain the most advancement which may produce reliable and sustainable PVT system. The cooling system’s design refers to the absorber design which mostly focuses on water and air-based PVT systems. An air-based system has been developed through different absorber configurations, air flow modes and single- or double-pass design. Hence, a summarization on various research and development of air-based PVT system will be presented.
Volume: 14
Issue: 3
Page: 1134-1140
Publish at: 2019-06-01

Evaluation of mobile microwave radiation severity at al-door residential complex in Iraq

10.11591/ijeecs.v14.i3.pp1281-1285
Younes S. Alwan , Mohammad Sami Zidan , Mohammed Qasim Taha
In this paper, the electromagnetic radiation of the mobile microwave signals, propagated by the mobile towers in Al-Door Residential Complex west of Iraq, is measured and evaluated. This complex contains main nodes and hub repeaters and feeders to transmit the service to the whole Salahuddin and the northern provinces. Therefore, this paper focused on this area to assess the radiation and to assess the radiation whether it is safe for humans or exceeded the dangerous level. The area has been divided on to 19 locations where there are mobile towers and the radiation is measured in these locations. The electric field intensity is unsafe and should be improved since it exceeds the level of 1.7 V/m. However, the magnetic field intensity is acceptable according to the measurements. In general, the electromagnetic radiation density is unsafe since many readings override the level of 1.3 μW/〖cm〗^2. The standards of the radiation severity are based on the recommendations of LATNEX Corp.
Volume: 14
Issue: 3
Page: 1281-1285
Publish at: 2019-06-01

A nine-level hybrid current source inverter using common-emitter topology and inductor-cell

10.11591/ijpeds.v10.i2.pp852-859
Suroso Suroso , Daru Tri Nugroho , Toshihiko Noguchi
A different circuit structure of nine-level current source power inverter is presented and discussed in this manuscript. The proposed topology is based on the common-emitter inverter topology equipped with an inductor-cell circuit. The common-emitter inverter works as the main inverter circuits delivering a three-level AC current waveform. The inductor-cell circuit produces the intermediate output current levels for nine-level current output waveform. Proportional integral current controller was applied to regulate the current streaming thru the inductor-cell. Multi triangular carrier signals based sinusoidal pulse width modulation method was utilized to obtain a lower waveform distortion. The proposed nine-level inverter circuit was tested and examined. The test results verified that the new nine-level inverter circuit worked well producing a nine-level current waveform with less low-frequency harmonic components.
Volume: 10
Issue: 2
Page: 852-859
Publish at: 2019-06-01

Maximum power point tracking of partially shading PV system using cuckoo search algorithm

10.11591/ijpeds.v10.i2.pp1081-1089
Ahmed Ibrahim , Raef Aboelsaud , Sergey Obukhov
This paper presents a cuckoo search (CS) algorithm for determining the global maximum power point (GMPP) tracking of photovoltaic (PV) under partial shading conditions (PSC). The conventional methods are fail to track the GMPP under PSC, which decrease the reliability of the power system and increase the system losses. The performance of the CS algorithm is compared with perturb and observe (P&O) algorithm for different cases of operations of PV panels under PSC. The CS algorithm used in this work to control directly the duty cycle of the DC-DC converter without proportional integral derivative (PID) controller. The proposed CS model can track the GMPP very accurate with high efficiency in less time under different conditions as well as in PSC.
Volume: 10
Issue: 2
Page: 1081-1089
Publish at: 2019-06-01

Wireless power transfer to a micro implant device from outside of human body

10.11591/ijece.v9i3.pp1541-1545
Kazuya Yamaguchi , Kazuma Onishi , Kenichi Iida
This paper states wireless power transfer (WPT) from an AC power supply to a micro implant device in human body. At first, an equivalent circuit of WPT which contains biomedical tissue is constructed with an AC power supply, parasitic components, load resistance, and inductances. Then a state equation which stands for the behavior of circuit is found, and the expression of efficiency is derived as the ratio of the power of power supply and load. Finally an experiment is conducted based on the theoretical calculation, and the error between experimental and calculated result is computed and examined.
Volume: 9
Issue: 3
Page: 1541-1545
Publish at: 2019-06-01

A parameter less stochastic optimization technique for tuning of speed PI controller of DTC induction motor drive

10.11591/ijra.v8i2.pp105-112
Naveen Goel , Saji Chacko , R. N. Patel
The Direct Torque Controlled (DTC) induction motor (IM) drives over the years have been the work force of industries. The popularity of this motor drive is due to the low cost and low maintenance of induction motor coupled with the fast dynamic response and simple control structure of direct torque control method. The robust performance of the DTC induction motor drive depends on the proper tuning of its speed controller. The proposed paper make use of the stochastic optimization technique namely the popular Harmony Search Algorithm and is compared with the parameter free Jaya Algorithm for tuning the gains of the speed proportional integral controller. Simulation studies in MATLAB/Simulink shows the success of the Jaya Optimization for improving the performance of DTC drive with respect to speed and torque peak over shoot and steady state error under different drive operating conditions.
Volume: 8
Issue: 2
Page: 105-112
Publish at: 2019-06-01

Intelligent tuned PID controller for wind energy conversion system with permanent magnet synchronous generator and AC-DC-AC converters

10.11591/ijra.v8i2.pp133-145
T. Muthukumari , T. A. Raghavendiran , R. Kalaivani , P. Selvaraj
This paper presents the intelligent tuned PID controller-based Single Ended Primary Inductor Converter (SEPIC) for Maximum Power Point Tracking (MPPT) operation of Wind Energy Conversion System (WECS). As the voltage and frequency of the Permanent Magnet Synchronous Generator (PMSG) varies with the wind speed changes, Intelligent controlled SEPIC is utilized to maintain the constant DC link voltage. The intelligent tuned PID controller combines the advantages of both conventional and soft controllers. The 1.5MW variable speed WECS (VSWECS) with AC-DC-AC converter is developed using MATLAB/Simulink software. PMSG delivers a load/utility grid through an uncontrolled diode rectifier, intelligent controlled SEPIC and three phase inverter. The real time implementation of the proposed system is done by the DSP processor MSP430F5529. The performance of the SEPIC is tested in both simulation and experiment at different wind speed conditions. The performance of the proposed Intelligent MPPT control of SEPIC are compared with the conventional PID controller. Intelligent tuning of PID controller such as Fuzzy-PID, and ANFIS-PID is implemented in the proposed system and results are compared. The simulation and experimental results reveals that the proposed ANFIS method provide improved performance than the conventional PID method in terms of power quality.
Volume: 8
Issue: 2
Page: 133-145
Publish at: 2019-06-01

Optimal TCSC placement for congestion management in deregulated power systems using antlion optimization algorithm

10.11591/ijra.v8i2.pp77-88
Majid Moazzami , Hossein Shahinzadeh , Gevork B. Gharehpetian , Abolfazl Shafiei
Congestion management is one of the important issues in the deregulated power systems. There are several methods to eliminate congestion. Utilizing FACTS devices is an appropriate option for large-scale and quick control of flows of transmission lines. FACTS devices such as Thyristor Controlled Series Capacitor (TCSC) can help to mitigate the transmitting flow of power in the congested lines, which leads to an increase in the network loading ability as well as reduction of both losses and production costs. Due to the considerably high price of FACTS devices, it is important to determine their optimum location on the network. Accordingly, in this paper, the Antlion optimization algorithm (ALO) has been employed to conduct a congestion management analysis to determine the optimal location for the installation of TCSC, which is simulated on an IEEE 14-bus test system subject to satisfy the constraints of the market environment.
Volume: 8
Issue: 2
Page: 77-88
Publish at: 2019-06-01

A model of acceptance factors for business intelligence in manufacturing using theoretical models

10.11591/ijeecs.v14.i3.pp1544-1551
Ernie Mazuin Mohd Yusof , Mohd Shahizan Othman , Lizawati Mi Yusuf , Shamini Raja Kumaran , Ahmad Rizal Mohd Yusof
Manufacturing organizations implemented Business Intelligence (BI) due to many advantages offered by it. The lack of research on the acceptance of BI in manufacturing motivates the initiative in this study to have an understanding of the factors that influence the acceptance of BI in manufacturing sector. Therefore, the research proposes a model which indicates the acceptance factors of BI in manufacturing. An integrated model consisting of underlying models of Technology Acceptance Model (TAM), Expectation Confirmation Theory (ECT) and Task-Technology Fit (TTF) will be developed. The new model will formulate 19 hypotheses and 11 factors contributing to the continuance and acceptance of BI. The model will be tested using quantitative and qualitative survey conducted to Malaysian manufacturing companies and validated using Structural Equation Modelling (SEM) to investigate the causal and mediating relationships between the factors. The expected result is hoping to suggest that selected factors in the model are positively related towards the acceptance of BI in manufacturing. The results are also hoping to guide future initiatives by industrial practitioners to develop and distribute BI to the manufacturing market.
Volume: 14
Issue: 3
Page: 1544-1551
Publish at: 2019-06-01

Identification of robust controller for 3hp 3Φ induction motor

10.11591/ijra.v8i2.pp125-132
H. Sathishkumar , S. S. Parthasarathy
This paper deals about the identification of robust controller for 3hp 3Φ induction motor which is used in cable industry (Ravicab cables private limited) at Bidadi. In this cable industry 3hp 3Φ induction motor is used for cable pulling purpose. This industry is using PID (Proportional derivative integral) controller based VFD (Voltage frequency drive) for controlling the speed of this 3hp 3Φ induction motor. This VFD is not functioning well for the non linear load and disturbance environment. Therefore in this paper Neural network based speed controller is proposed as proposed controller-I for replacing the PID based VFD. Performance of the 3hp 3Φ induction motor is estimated when Neural network controller is interfaced with the motor. Then Neuro-fuzzy controller based speed controller is proposed as proposed controller-II for replacing the PID based VFD. Performance of the 3hp 3Φ induction motor is estimated when Neuro-fuzzy controller is interfaced with the motor. At last robust controller for the 3hp 3Φ induction motor which is used for cable pulling purpose is going to be identified by doing comparison chart between Neural network and Neuro-fuzzy controller.
Volume: 8
Issue: 2
Page: 125-132
Publish at: 2019-06-01

QoS hybrid uplink scheduler based on service type for M2M communications in LTE networks

10.11591/ijeecs.v14.i3.pp1460-1470
Mariyam Ouaissa , Abdallah Rhattoy
The introduction of Machine-to-Machine (M2M) communications in cellular networks creates a new set of challenges because of the unique service requirements and features of M2M devices. One of these challenges is the management of radio resources, especially on the uplink because of the unfairness and poor performance that occurs when allocating resources to users. Long Term Evolution (LTE) and LTE-Advanced (LTE-A) are excellent candidates for supporting M2M communications because of their native IP connectivity and scalability for a variety of devices. Therefore, LTE schedulers should be able to meet the needs of M2M devices such as time constraints and specific Quality of Service (QoS) requirements. In this paper, these constraints are studied and analyzed, focusing on three schedulers; they are Round Robin (RR), First Maximum Expansion (FME) and Maximum Throughput (MT). These methods do not provide QoS to users who use different types of traffic flows. The solution proposed in this work is a hybrid model between two schedulers each of them is the best scheduling solution for the real-time service and the other for the non-real-time service, in order to meet QoS criteria maximizing throughput and minimizing packet loss. Video and voip were selected as real-time traffic and best effort for non-real time. The simulations results show that the proposed scheduler reaches the lowest Packet Loss Rate (PLR), delivering highest throughput and goodput among the other strategies.
Volume: 14
Issue: 3
Page: 1460-1470
Publish at: 2019-06-01

Featureless EMG pattern recognition based on convolutional neural network

10.11591/ijeecs.v14.i3.pp1291-1297
Too Jing Wei , Abdul Rahim Bin Abdullah , Norhashimah Binti Mohd Saad , Nursabillilah Binti Mohd Ali , Tengku Nor Shuhada Binti Tengku Zawawi
In this paper, the performance of featureless EMG pattern recognition in classifying hand and wrist movements are presented. The time-frequency distribution (TFD), spectrogram is employed to transform the raw EMG signals into time-frequency representation (TFR). The TFRs or spectrogram images are then directly fed into convolutional neural network (CNN) for classification. Two CNN models are proposed to learn the features automatically from the images without the need of manual feature extraction. The performance of CNN with different number of convolutional layers is examined. The proposed CNN models are evaluated using the EMG data from 10 intact and 11 amputee subjects through the publicly access NinaPro database. Our results show that CNN classifier offered the best mean classification accuracy of 88.04% in recognizing hand and wrist movements.
Volume: 14
Issue: 3
Page: 1291-1297
Publish at: 2019-06-01

Demand of ICT-based chemistry learning media in the disruptive era

10.11591/ijere.v8i2.17107
Ratna Kumala Dewi , Sri Wardani , Nanik Wijayati , Woro Sumarni
The challenges of education in the era of the industrial revolution include disruption 4.0, 21st-century skills, globalization, and global competition. Chemistry is a subject that needs to be developed in order to improve the educational system in the era of disruption. The purpose of this research is to identify and analyze the needs of the media-based chemistry study ICT at grade X redox materials in State Senior Highschool 8 Semarang during the disruption. The method used in this research is a descriptive qualitative method which consists of the study of literature and the study of the field. Method of data collection is done through observation, question form, documentation, interview teachers, as well as interview students. This research instrument consisting of a sheet of observation, question form, and sheet interview. The results showed that chemical-based learning media limited ICT in State Senior Highschool 8 Semarang redox materials especially in class X. That is because of the teacher's difficulty in innovating to develop learning media chemistry-based ICT and lack of student understanding and literacy in the study of chemical materials. Teachers play an important role in order to educate the students towards the era of disruption. In this era of chemical subjects not only taught students with literacy (reading, writing, math) but the need for a new form of literacy the literacy data, technology, and human resources in order to overcome learning difficulties and improving students learning outcomes for better value.
Volume: 8
Issue: 2
Page: 265-270
Publish at: 2019-06-01
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